【 Weak current College 】 on power of some emergency method

There will always be some unexpected things, these matters are referred to as emergency, power is a sudden event. Power abruptly, although only a few short seconds, sometimes causing our computer cannot access the Internet.
UPS also called uninterruptible power supply, the supply of urgently, to prevent a sudden power loss, affecting its normal work, damage to your computer. We all computers are connected to the UPS, but one of the UPS is not timely, the connection in the UPS on all the servers stops working. These servers are configured to power it will automatically start, but there is doubt as a result of access to the network, the DNS server will not restart. Only manually start the DNS server, the query will be processed manually by a trouble, unable to timely start DNS will exacerbate destruction of power failure. If you lose power, the majority of cases, we will all server connected to the UPS, the UPS will malfunction, particularly the use of longer duration.
If you experience a power failure, the server is off line, simply restore power after starting the server can handle queries. Previous outage occurs, you usually have to work from the cessation of the server backup to perform a restore. Now, when a file or print server when there is doubt, we seldom use restore this again. Many people do not realize it, but the NT file system (NTFS) indeed contains a power outage protection method. Only the create or change a file, NTFS will this action as handlers. This means that, in the action before writing to the hard disk has been written to the transaction log. In fact, any time you want to write a file to an NTFS, Windows will perform the following operations: processing of the records in the RAM meta-data operation in the log file; in RAM records actual meta-data operation; mark in the log out of the deal; will log dump in your hard drive; in HDD write actual meta-data operation.
Perform these steps, in the event of a power loss situation, Windows will automatically run CHKDSK, as part of a startup. Chkdsk log files to a hard drive. If the log file is processed, but the process is not on the hard disk, or incomplete, Windows will use information in the log, update hard disk reconfiguration. The only missing data are usually very small, are those that are written to RAM log, it was not flushed to disk in a handler for the log file.
In many cases, if you use the program relies on a database, the power loss would destroy the database. ExchangeServer is dependent on the database server. It in a similar form of NT documentation system using transaction log. Nevertheless, in the case of a power outage or lose some data. If this happens, restart the server, the database is in a State of conflict. Then you have to assemble the database before applying some built-in maintenance tools to restore a database. Dependent on the database using a variety of programs. Some use program database will use the transaction log, while others will not. If your database server power failure, but it does not use a transaction log to perform guard, then you have to perform a restore from a backup.